CG effects galore! Too much flashing eye-candies can result in a hyperglycemic attention span.
I get bored watching most action films that simply showcase CG effects. What engage me are the philosophical references and/or soundtracks. Tron: Legacy and I, Robot fit the bill. I liked the machine vs. human theme, manifested in the form of zen symbolism and Asimov's Three Laws of Robotics, respectively. Their soundtracks kick ass too.
Iron Man 2, by comparison, was a disappointment after Iron Man 1. Tony Stark is a rather one-dimensional character. I'm not so sure whether he gives The Institvte a good name or not...
I can sort of see why Olivia Wilde took a break from House to star in Tron: Legacy. The zen references make the movie more interesting than it otherwise would be. I wonder if her character's name, Quorra, alludes to zen koans (quorra - query - riddle - koan) That would be a clever trick. She portrays these mysterious characters rather well, while giving them a certain approachability and hence more sympathetic to the audience, i.e. Thirteen from House.
On the other hand, Summer Glau is good at playing the really "exotic" types of characters, i.e. River Tam from Firefly, a child prodigy who becomes the subject of human experimentation. She's like the female equivalent of Keanu Reeves, at least re: their movie roles :-P
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